andark: Restore redraw on charging and small fixups #3692
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PR #3678 removed immediate redrawing on charging, which is inconvenient, since when you connect the charger, watches may be locked and thus not redrawing, not showing the charging status. Additionally, I did a small correction regarding to the cleanup order to make fast loading work well, since one timeout was removed before a callback that could reset it again. Also, I did some (I hope) reasonable refactoring. I did all in separate commits to make the review easier.